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 Venn diagram problem?

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T O P I C    R E V I E W
mingshum Posted - 01/09/2009 : 19:25:17
Help...can this problem from The Official SAT Study Guide be solved with a Venn diagram?

Set X has x members and set Y has y members. Set Z consists of all members that are in either set X or set Y with the exception of the k common members (k >0). Which of the following represents the number of members in set Z? Why is the answer x + y - 2k and not x + y -k?
2   L A T E S T    R E P L I E S    (Newest First)
mingshum Posted - 01/10/2009 : 07:23:23
Thank you Ultraglide...can't believe I didn't see it.
Ultraglide Posted - 01/09/2009 : 22:48:56
When you combine X and Y, the common members are counted twice - once in X and once in Y.

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